well i think its a new thing for me if there is such a thing that could make the masternode rewards just up to 60% rather than 80%. good luck to your project anyway..
The block rewards will be splitted between Masternodes/Guardian nodes, miner and dev fund. Sparks has more to offer than just the regular block rewards. Guardian nodes will also receive a split of the transactions fees earned by SparksPay. For more detailed information you can join the Sparks Discord
https://discord.gg/GnhKXFS